This is a game where the application randomly picks a number between 1 and 100, and you have to guess the number. It tells you if you need to guess something higher or something lower. When you finally guess the right number you can play again.
It keeps track of how many tries it took you to get the correct number, so you can play again and again trying to guess the number in the lowest possible tries.
It's fun for all ages, but it was intended for children in grades K-2 to help build number sense.